I tried to delete all content in my Neo4j 3.3 database through the Neo4j browser. I used:
MATCH (n)
DETACH DELETE n
Unfortunately, the browser is keeping a list of old (obsolete) property keys, so that (after refilling the database) autocomplete still lists these property keys that are gone. Any way to get rid of them?
As described here, Neo4j Browser just display the data provided by Neo4j database through CALL db.propertyKeys().
There is an open issue in the Neo4j's Github repository about removing unused property keys from db.propertyKeys() results.
Since you are deleting all your nodes and relationships, you can alternatively delete all content of <neo4j-home>/data/databases/graph.db/ folder and restart Neo4j service. But you will need to recreate all indexes and constraints.
Related
My Neo4j version is community-4.2.4 in the Mac OS.
I used 'bin/neo4j-admin load --from=xxx/g.db.dump --database=xxx.db --force'. And succeed in finding db file in /data/databases as photo showed below.
enter image description here
But the result returned in Browser adding 'show databases' and cannot find the database what I want.
Thanks u guys all for helping me.
OR sending email for communicating more at masichengyo#gamil.com.
So neo4j-admin load and neo4j-admin restore take care of setting up the db in the filesystem. Back in the 3.5.x days this was enough, provided the name of the graph directory matched the name of the active graph configured in the neo4j.conf.
In Neo4j 4.x we support multidatabase, and the system database is where we can do things such as creating new databases, and if you CREATE DATABASE in the system db with the name of the new database, it will use just use the files it finds and create the entry in the system db, allowing you to use it and switch to it in Neo4j.
Since you're on community edition, you won't be able to create a new database, you're restricted to only the neo4j database, so your import would have to force it using neo4j as the db name, and it would overwrite your current neo4j db.
If you need to create multiple databases besides neo4j and system, then you need to be using enterprise edition.
I imported a graph database into neo4j where the node files had labels assigned in the headers, as the manual instructed. When I use the web interface, the database details tab says there are no labels in my database though. When I run queries involving node labels, everything seems to work. Has anybody else run into this issue?
Try reloading the browser page. The displayed Node labels are not updated dynamically.
I've deleted all my nodes and relationships (Delete all nodes and relationships in neo4j 1.8), but I see that in Neo4j Browser the "property keys" that existed before the deletion remain.
See the picture below:
How can I make all the "Property Keys" go away too, so I can end up with a fresh new database? I understand this orphan property keys do not pose a problem themselves, but they clutter the browser experience and will start confusing with newer properties.
Thanks!
You should be able to clear everything out by:
stopping your Neo4j database
deleting everything matching data/graph.db/* (look inside the graph.db folder)
starting up again.
What version of Neo4j are you using? Prior to to version 2.3 there is a file named keystore in the data/ directory that was used to populate this in the browser. Deleting this file will clear out the Labels, Relationship Types, and Property Keys listed in the browser.
Looks like this has changed now with Neo4j 2.3 so if you are using the latest version I don't think you'll have this file.
In the manual you can see that there is currently no way to disentangle which property keys are currently used without traversing the graph.
http://neo4j.com/docs/stable/rest-api-property-values.html#_property_keys
Which is a bummer because I'd like to do the same thing. TBC.
I have Neo4j Community Edition 3.2. To get rid of the property keys (and get rid of the entire DB), I completely uninstalled Neo4j, deleted the Neo4j folder in C:\Program Files and then reinstalled the package again so that I had a fresh DB to work with. Not ideal to delete everything but it worked for me.
I got rid of the properties by open a new DB.|(I didn't want to delete my old folder )
Create a new folder beside the default folder
stop the server
choose the new folder and start again a new DB with new PW
Actually, there is not a way to just delete the unused properties. You need to recreate the graph or use a tool to copy neo4j stores called "store-utils".
I have created neo4j nodes and relationships from java code , i am trying to use Neo4j webadmin panel to display them as a graph.
I have changed server config property "org.neo4j.server.database.location" to point to the DB folder i have created from java program.
Is there any other changes i need to do in order to view the nodes and relationships? how to achieve the same?
Please guide.
You need to make sure your java program is shut down as it's not possible to access a graph.db directory more multiple Neo4j instances (1 server and 1 embedded in your example) at the same time.
Aside from this make sure you're using the same version.
In a Test, I made many types of nodes and relationships with Cypher syntax.
After all, I delete all of unneccessary nodes and their relations.
Actually, there are Types and Labels still there in my Browser
Are there any method to clear Or change name of unneccessary Type, Label with Neo4j and Cypher..??
Best regards
All the information is stored in the browser local storage. So If you are using chrome browser, once you are in localhost:7474/browser. right click your mouse and select "Inspect Element", this will open a chrome developer tool, then go to Resources and under resources, go to "Local Storage", you should see "http: //localhost:7474". select it. and select the key neo4j.grass, you can modify the value, by copying out and copying it back. or you can just delete the whole record (key and value) and close your browser. Open your browser again. start clicking on the labels. you will only see the labels you want. You can repeat this to clean up until neo4j come out with a better way.
if you are using firefox, you can install firebug, and click on the firebug then dom then local storage. then you can do the similar thing
for other browser I am sure that you can figure out ways(google) to clear the local storage
This cypher query deletes all nodes and relationships:
start n=node(*) match n-[r?]-() delete n, r;
You can customize it adding index or asking if it has attributes:
start n=node:users(':') match n-[r?]-() delete n, r;
If you've removed the labels from all nodes you should be able to get a clean result visualization stream by clearing your web browser's cache/cookies. This will not remove them from the info bar on your left, only from the graph vis. frame. Since labels and relationship types are database global constructs, unlike properties, they can exist in the database also after all their instances have been deleted. That may be the intended behavior, but I would expect there to also be a way to remove them completely from the database when 2.0 is released (if there isn't a way already that I've missed). If you want a clean start you can always stop your server, delete your database directory, and restart the server. You may still have to clear your browser or you may see ghost labels from your old database still haunt your visualization stream.
Searching for a removed label, I found that they are still left in data/graph.db/neostore.labeltokenstore.db.names, wh.
Remove nodes you don't want, backup DB, purge DB data dir, stop / start server, reinsert DB, enjoy.
I tried following on both Firefox and Chromium and it didn't work:
removing all nodes of types I no longer used
clearing localStorage neo4j.grass key - it does contain labels, but this doesn't help
clearing whole localStorage (completely)
stopping / killing server and bringing it back after points above
removing files with labels in their names from DB data dir
removing all neo4j cookies (in fact, later, whole browser cache as well)
Since purging DB and reinserting data worked, and since clearing local storage and launching another browser gets you same labels you had, I'm guessing the info is held partially in localStorage AND partially in files in graph.db dir (or however your DB dir is called). Files there are often binary, so I picked redoing whole DB (since it wasn't big anyway) over blind edits or decoding binaries - simply faster.
EDIT:
You may try something I've just spotted:
label > properties > view Stylesheet > click on drop icon (looks like extinguisher). This should drop the grass key.
You may need to have at least one node of given type for that, to open a view where you actually set up node display (colors and other properties) to get to it's stylesheet.